The garden of Herschel House is laid out in a way that 18th century gardens were, with the same sort plants.
Somewhere in the garden William Herschel had his telescope set up the night he discovered a planet. (His sister was elsewhere.) No one knows where he set up his telescope. I read recently on one website that it was thought to be where the sundial is, but I hadn't seen that before. The garden used to extend much further back than it does today. There's a good chance that where the telescope was isn't part of the property anymore.